To all whom it may concern



Quits giants igetent @ffim'.

IMPROVED FIRE-BRICK.

@Llge .htlgchule more in in flgese iii-tiers 392mm nut milling part at flgc same.

TO ALL WHOM 'IT MAY' CONCERN:

Be it known that I, SAMUEL K. WELLMAN,'Of the cityof Nashua, in the county of Hillsborough, and State of New Hampshire, have invented ascertain new and useful Improvement in Fire-Brick; and I do hereby declare that the following is a full, clear, and exact description ofthe same To enable those sliillcd in the art to which myinvcntion belongs to make and use it, I will now proceed to describe the same.

There have been meny (lifierent kinds of fire-brickinvcntd and used, but to most, if not all of them, there are many practical objections. When subjected, as they are, to great heat, and in some cases't-o intense heat, they scale oil, creek, crumble, or fuse,and thus become useless. After repeated experiments I have invented an improved fire-brick, \vhich from actual trial appears to obviate all of the foregoing and other' objections. I

use, in the manufacture ofrmy improved fire-brick, the following'metcrials and in substantially the proportions named fire-clay, fifty per cent; diamond rock (very pure" quartz) crushed to the fineness of flour or dust, twenty-live pcr oer/0.; diamond rock (very pure quai'tz) coarsely crushed twenty-five per cent. The materials may be mixed and prepared for the burning-kiln in any of' the Well-known modes- If only the diamond rock coarsely crushed is used, the bricks do not 'ahswer the purpose, nor V will they if only the powdercc diamoiid rock? is used. In the lettercnsc they are too compact and dense and conduct the heat too much, while the surface exposed to the action of the heat is liable to scule ofi'. By using, however, the diamond rock about in the proportions named, one-half reduced to arfine powder or dust, and the other half coarsely crushed, say to the size of kernels of wheat or corn, great practical advantages are obtained. The brick resist the action of the fire, are non-oonduc'torgnnd do not crumble nor scale off.

Having described my improved fire-brick, what I claim as new and of my invention, and desire to secure by Letterslatent, is-- An improved fire-brick, when madelfrom the materials, and combined in'the proportions and in the manner substantially as above described.

SAMUEL K. WELLMAN.

Witnesses FRANKLIN MUNROE, SAML. T. WELLMAN. 

